Why do the heathen
gowy (go'-ee)
a foreign nation; hence, a Gentile; also (figuratively) a troop of animals, or a flight of locusts -- Gentile, heathen, nation, people.
rage
ragash (raw-gash')
to be tumultuous -- rage.
and the people
lom (leh-ome')
from an unused root meaning to gather; a community -- nation, people.
imagine
hagah (daw-gaw')
to murmur (in pleasure or anger); by implication, to ponder -- imagine, meditate, mourn, mutter, roar, sore, speak, study, talk, utter.
a vain thing
riyq (reek)
emptiness; figuratively, a worthless thing; adverbially, in vain -- empty, to no purpose, (in) vain (thing), vanity.